No one has addressed the, to me, obvious bit of weirdness here: Why does the larger turtle TOLERATE a small turtle climbing on top of it? I see why the small turtle goes where it does, but why does the large turtle allow it?
The larger one probaly does notice it’s there. I don’t think they have much feeling on their shells. Also if it does notice the smaller one I bet it would more trouble then it’s worth to remove it.